: It looks like Solr does not use a simple cached queryfilter as a query
: cache. Why is this? Is a cache queryfilter not efficient enough? Is this
: alternate method just so you can easily load the cache from an old
: Searcher to a new Searcher? Any info appreciated.
This would probably be better addressed on the solr-user mailing list --
please post any followup question there.
I'll through out some high level answers though in case any one else is
interested...
* there's nothign to stop a solr request handler from using
QueryFilter's if they want (i have and do)
* Solr has several types of caches for different things
* the "filterCache" has the most direct conceptual mapping to how a
QueryFilter and CachedWrapperFilter work. The big benefits it has are:
- the DocSet API allows for more memory efficient representations of
small sets of documents then just a BitSet
- it can be configured with a size and replacement strategy
(CachedWrapperFilter is more for things that can live "forever"
relative the IndexReader)
-Hoss
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